The Philadelphia Phillies fired manager Rob Thomson on Tuesday morning and named bench coach Don Mattingly as interim manager for the remainder of the 2026 season.

Philadelphia sits at 9-19, tied with the New York Mets for the worst record in Major League Baseball and 10.5 games behind the division-leading Atlanta Braves. The team endured a 10-game losing streak during April and lost 13 of its last 15 contests, marking a sharp decline from the 96 victories it posted in 2025.

Thomson, 62, had managed the Phillies since June 3, 2022, when he replaced Joe Girardi midseason. He compiled a 355-270 record (.568 winning percentage) over that span, guiding the team to four consecutive playoff appearances, including a World Series trip in 2022 and back-to-back National League East titles in 2023 and 2024. The Phillies extended Thomson's contract through 2026 last October after his successful run.

President of baseball operations Dave Dombrowski decided following several days of deliberation after a 6-2 loss to the Braves on Sunday. This marks the second time Dombrowski has dismissed a Phillies manager during his tenure.

Mattingly, 65, steps in after serving as the Phillies' bench coach for the first 28 games of the season. A Hall of Fame-caliber player during his Yankees career, he brings extensive managerial experience with five seasons at the helm of the Los Angeles Dodgers and seven with the Miami Marlins. He is the father of Phillies general manager Preston Mattingly.

The move includes other staff adjustments. Third base coach Dusty Wathan moves to bench coach, and Triple-A skipper Anthony Contreras joins the major league staff as third base coach.

The Phillies rank near the bottom in runs scored and have struggled offensively, with hitters in the six-through-nine spots posting a .337 OPS. Starting pitching offers hope for improvement as pitchers like Zack Wheeler return from injury, and the team faces nine of its next 13 games at home against the Giants, Athletics, and Rockies.

FanGraphs gives Philadelphia about a 40% chance of reaching the playoffs despite the slow start. Mattingly's even-keeled approach could provide a steadying influence amid the roster's challenges.